Is There an Easy Way to Locate Unconnected Lines in Sketch Mode?

In Sketch mode, many times I finish a sketch, and although it appears to me that the lines are all connected, after exiting Sketch mode the shape does not ‘fill in’ and I can’t continue onto Extrude. This obviously means somewhere, one or more of my lines is not connected and the sketch isn’t closed; Up till now I’ve had to go back into Sketch mode, zoom all the way in, and inspect the whole sketch to locate the unconnected points. Is there an easier way to do this? Is there something I’m currently unaware of that indicates when two lines are not connected?

I don‘t think there is such feature, but it might be a good use for the new red colored sketch, one could color the two nearby dots red, to signalize this

not sure what you mean by “red colored sketch”, is this a new feature?

Yes, when having an error in your sketch, the part where the error lies should be colored red